JPA Tutorial 1 - Persistence Unit

We now need to create the Persistent Unit definition. Create a file called persistence.xml in the src/META-INF directory with the following contents:

persistence.xml

<persistence>
    <persistence-unit name="examplePersistenceUnit" 
                      transaction-type="RESOURCE_LOCAL">
        <properties>
            <property name="hibernate.show_sql" value="false" />
            <property name="hibernate.format_sql" value="false" />
 
            <property name="hibernate.connection.driver_class" 
                      value="org.hsqldb.jdbcDriver" />
            <property name="hibernate.connection.url" 
                      value="jdbc:hsqldb:mem:mem:aname" />
            <property name="hibernate.connection.username" value="sa" />
 
            <property name="hibernate.dialect" 
                      value="org.hibernate.dialect.HSQLDialect" />
            <property name="hibernate.hbm2ddl.auto" value="create" />
        </properties>
    </persistence-unit>
</persistence>

The Steps

1. Expand your project (JpaTutorial1)
2. Select the src/META-INF directory
3. Right click and select new:File
4. Enter persistence.xml for the name and press Finish (Note: all lowercase. It won't make a difference on Windows XP but it will on Unix.)
5. Copy the contents (above) into the file and save it.

Verify This Works

1. Select the test
2. Right-click on entity and select new:Class
3. Enter PersonTest and click Finish
4. Enter the example code below:

package entity;
 
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
 
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
 
public class PersonTest {
    private EntityManagerFactory emf;
 
    private EntityManager em;
 
    @Before
    public void initEmfAndEm() {
        BasicConfigurator.configure();
        Logger.getLogger("org").setLevel(Level.ERROR);
 
        emf = Persistence.createEntityManagerFactory("examplePersistenceUnit");
        em = emf.createEntityManager();
    }
 
    @After
    public void cleanup() {
        em.close();
    }
 
    @Test
    public void emptyTest() {
    }
}

1. When you're finished and it all compiles, right-click within the source pane, select Run As:JUnit Test
2. You should see all green
3. If you do not, comment out the following line and review the console output

        Logger.getLogger("org").setLevel(Level.ERROR);